chauveau



Patented May 17, 1927. 1,628,553 UNITED STATES PATENT OFFICE.

LOUIS L. E. CHAUVEAU, F PARIS. FRANCE.

CALL SELECTOR.

Application filed June 27, 1923, Serial No. G l-7,992, and in France July 13, 1922.

The present invention has for its object an from plus to contact key 35, as above, to application to distress signal reception on magnet coil 8. through armature 6 and front ships of call selectors similar to the U. S. contact to minus, energizing magnet 8 and patent applications for call selectors filed drawing over armatures 9 and 1.0. 60

August- 17, 1922, Serial No. 582,546 and The circuit formerly closed from plus to 611,537 filed January 8, 1923, by me. 35, etc. through armature 10 and rear con- As well known the distress signal consists tact, magnet 11 to minus is now broken atof the letters S. O. S. of the Morse code 10. Also, circuit is completed from plus to magnet 8, as above. through armatures 9 and Like the apparatus forming the object of 26 to minus. thereby providing a circuit to the above mentioned applications, the call magnet 8 independent of armature 6. Thus. selector disclosed herein has for its object magnet 8 holds closed regardless of armato cause the actuation of a calling means ture 6. However, slow acting magnet 11 is (hell or the like) in response to the recepstill energized, even though its circuit has 70 15 tion of signals. the regular succession of already been broken at 10. After a brief which constitutes the S. O. S. signal in this interval. armatures 12 and 26 will be recase. leased. thus opening the holding circuit to The single figure of the drawing herewith magnet 8 at 26 and. closing the circuit to is a diagrammatic view of a call selector acarmature 7 and rear contact through armacording to my invention. ture 12and rear contact. The breaking: of It comprises therefore first an arrange magnet 8 circuit releases armatures 9 and 10 ment for making possible the selection of which break the auxiliary holding circuit to dots and dashes, in a somewhat similar coil 8 again at 9 if armature 6 is at rest manner as the one described in my former and makes the circuit to magnet 11 at 10. application and second an arrangement for respectively. both circuits having already controlling the order in which the signals been described. The circuit to magnet 11 are received which arrangement is somewhat being again completed. the armatures 12 similar to the one described in my latter and 26 will be drawn up as shown in the mentioned application. drawing, but no current will flow to magnet 30 For this reason in the attached drawing 8 because its holding circuit is already and the following description the elements broken at 9. magnet circuit 8 being also open (relays, contacts, connections) which have at (i. as. for example, in the case of a dot. already been described in the above men- In the case of a dash. magnet 11 would retioned applications are designated by the lease its armatures before contact 1 were re- 90 same reference characters and the new eleleased. and therefore armature 6 would be ments are designated by reference characters closed, thereby holdin; armature 9 closed beginning with 60. and magnet circuit 11. through 10, open urn For the purpose of facilitating undertil contact 1 is released. standing of the present description. we will It is understood that this action occurs 5 4 briefly repeat what has already been said each time contact 1 is closed. and that magin the above mentioned applications relanet 11 is timed to release its armatures only tive to the control of the order in which the when contact 1 has opened after the time signals arrive. duration of a dot but during the time dura- The signal relay 2 is controlled in retion of a. dash. loo spouse to received signals by means of conlVhen contact 1 is closed, armature 7 comtact 1 which may be a manually operated pletes the circuit with wire 14 and when it is kev or any other contactsuitable for interopen, 7 completes the circuit with 15, and 1 mediate relays controlled by a receiver for is closed when armature 12 closes for a dash wire or wireless telegraphy. and 1 is open when. 12 eloses'at'ter a dot. 105 Upon the receiving of an impulse, magnet Therefore. when a dot is received and coin will become energized through plus source tact 1 is released. an electrical mpulse will.

of electricity from contact-key 35. armature be sent through dot line wire 15 immediately 3? and rear contact to armature 58 and rear afterward at the time relay 11 releases armacontact. to relay contact 1, magnet 2 to ture 12 to close the circuit to armature 7 minus. This, in turn will draw over armaand rear contact. When a dash is received,

turesT. 40 and 6. Circuit will now be made an impulse willbe sent through dash line wire 14 beginning about the middle of the length of time the contact is held closed for the dash and ending when contact 1 is released. The purpose or relay 11 is to close the circuit of armature 7 after contact 1 is released for dot or before it is released for a dash. The line 14 will be called the dash line and line 15. the dot line. \Ve have therefore an arrangement which makes possible the separation of dots and dashes.

The arrangement which is used tior controlling the arrival of the signals of the group is as l ollows:--The signal magnet 2 controls armature 410. For this reason, when the apparatus is at rest, the magnet 41 will be energized through plus to contact 35, armature 33 and rear contact, armature 58 and rear contact, magnet 41. armature l0 and rear contact to minus. hen so enere'ized it locks up through armature 42, armature 4-5 to minus.

Upon the receipt of the first signal, magnet 2 becomes energized and draws over ari'nature 4:0 to front contact, thus opening; the circuit to magnet 4-]. T he circuit comparsing plus to 35. 33, 58. armature 64. mag:- net d7. 48. signal. line 46, magnet 44;. armature will then be closed at 40 and rear contact to minus, thus energizing: magnet l t. However, as soon as 4% is energized, and the circuit from magnet 41. to armature 40 and trout contact having already been broken, the circuit comprising from plus 35, 33.. 58, magnet -11. armature to minus will be broken ate?) and rear contact. The magnet 41 will hecome die-energized and open or release armature 43 and the electro-magnet ll. will no longer be energized while relay 2 energized. It will be seen by this that at the beginning of each signal a. short impulse is sent through signal line 4.6 through the tollo ring circuit l his to 35. (i4. magnet 4-7. 4:8. signal hue 46, magnet 4:4. it 40 to minus. until the circuit is broken at 43.

Upon the reception of the first signal. the eleetro-magnct 4;( will be energized by this impulse and theretore lock up through armature l8 and trout contact to minus. Through its armature 4-9 and :trout contact, the magnet 17 connects the circuit plus to 35, 58, (it. magnet 50, 51 to 49. signal line 4-6 to magnet 44. to armature 4-3 which is open. l i'heu arn'iatnrc 40 is released it will energize magnet .l-l again to close armature 'lhus. the electro; agz'net 50 will respond to the second signal through plus to 64, as above. through magnet 50. 51. 49. signal line l6. magnet l l, 4C2. upon the second closure of armature 41:0 to front contact and to minus. The UlfllliI-lnlii'lltil 50 will respond to the second signal to lock up at 51 and to connect through armature the third signal magnet with the line 46 in the same way, and the magnet 53 will operate in the same we; at the begini'iing ot the third signal.

l. 47/ the proper functioning or iis arrar 'einent Y0 it necessary that the armature 43 be locked in its actuate-rt position and i sconnected from the line 4-6 as soon as the begins to operate Furtherni ture 4-9 mustnot close opcation. The same tor the urniatures oi? The n'iag'net eli'r ma 7 open not ell rer" early because the arm is opened upon the successive ope these two magnets and the line t?) is always supplied with current For a suliiciently long; time to insure the energlization of one of the magnets ll. 50 and 53.

The purpose ot the signal magnets 17. 50 15 and 5? is to connect with the dot. line 15 or with the dash line 14: through armatures T5 or To one end ot a so-callcd general zeromagnet 22). This magnet s gn'm'iih-izl tor the purpose of opening at 58 the current sup ply circuit of the apparatus upon the receiw inn of :i 'talse signal. li or'this purpose the magnet 23 is connected through contacts 19. l8. l? with the conduct-.11 8G in accordance with the receiving): of the signals. is will he set forth more in detail this conductor is connecteijl with the dash line when the desired signal is a dot and rice Yer-sin whereby when a tale'e signa is re e ved (dash instead of dot or vice versa) are net 23 is energized and releases to normal the \arious relays by o 'ienine at 53 the common lead to that side ot the, sourc f power. (in the other hand it the. a received are correct the magnets ll. 50. will opl0 crate in the normal until the one is zit-tinned which ll cause then regrifl 'ition of ti i ll; receiving of the first signal magnet is? is operated the armatu e 2 will close and connect the line the minus polo ot the current supply sou ce prothis ..l in a silent is too lone. then the in armature 25% whereby than of line o8 and armature magnet 2. will be operate 'l. thcrc'tore that it the silent period between !-J-T. u LWO impulses oi iilllC-r one and the same letter composed is too long. th n the up paratus is returned to zero.

It will be seen from the aboi'e descrip- (Ell tion that the S. O. S. selector .is like the call selector formingthe object of U. S. pat; ent applications previously referred to in so far as the selection of dots and dashes and the control of the order in which the inn pulses constituting one and the same letter are concerned. However, for the purpose of accomplishing the particular object of the S. O. S. selector the following must also be provided:

1A zero letter relay 63 the purpose of which is to restore to normal the impulse magnets after the receiving of a correct lettier.

2 -A second letter relay 69 which operates immediately upon receiving of the first letter if such letter is correct, for the purpose of preparing the different circuits corresponding to the second letter.

3A switching magnet Tet which in its resting condition and upon the receiving of the first and third letters suitably connects the contacts of the impulse magnets 4-7. and 53 with the dash line .14 and the dot line 15 for the purpose of obtaining the combination corresponding to the first and thi d letters S This magnet is energized upon thereceipt of the second letter and suitably connects the same contacts for the purposp of obtaining the second letter O 4 A magnet 78 for the third letter which prepares the circuit of the auxiliary third letter magnet 81 at the end of the sec-' ond letter if such letter was ceived.

5-An auxiliary magnet 81 for the third letter which upon the beginning of the third letter arranges the circuits so that this third letter if properly received will cause the actuation of the ringing magnet Ill.

6-11 difierentiating magnet 67 which acts as a supl'ilt-nnentary silence magnet and is energized upon the termination oi" each letter for locking the circuit otthe normal silence magnet 27 whereby the silent: periods between two letters may be longer than the silent periods between impulses.

The operation of. this circuit arrangement is as "follows:

During the reception of the first letter of" the signal (such as the letter S the switching magnet 74: not energized be cause the circuit magnet- (39 which controls armature 71 through plus to 85. 33. magnet 69, 77. 83 is not energized due to the open armature 61. The line 86 is connected through the armature 75 with the dash line 14. In View of the fact that line 86 connected with the controlling arn'iature ll. 18 and 19 of the impulse magnets ll. fit) properly reand it the letter received is the letter S then the closing of the armaturcs of the electro-magnets will progress in a normal manner. On the other hand it one 'pulses are dots as they should he, then the armatnres will be operated in the normal.

manner and upon the reception of the third impulse otthe first letter the n'iagnet. 53 becomes energized and closes the a'maturo (it) whereupon the quick closing but slow opening supplementary silence magnet 67 is energized. This magnet locks up through its armature 68 the circuit of the ditferentiating silence magnet- 27. whereby the latter can not become deenergized upon the cessation of the sending but only after the expiration ot a sufliciently long period of time which depends on the adjustment of the. magnet (5. This magnet- 67 is deenerprized through the opening of armature in response to the energization of relay '3 which opens a mature 64 and the circuits to magnets 4-7, 50 and The silent period between two letters may therefore be longer than the silent period between two impulses. The dot line 15 is connected upon the reception of the third signal through the armat-ure T6 of the deenergized magnet 74 and. through the conductor 87 with the arn'iatnre 61. For this reason if the third impulse is a (lot (that is to say it it is the correct inmulsc) then the second letter magnet 69 will becon'ie energized (armature (i1 actuated. 83 at rest and 77 is at rest). The elcctroanagnet locks up and by closing its aru'iature 71. will cause the energization of the switching magnet 74. .This magi'ict connects the dot line 15 with the armaturcs 1T. 18 and ll) of the impulse magnets 47. 5t) and 53 in a manner suitable to control the impulses oi" the second letter.

At the same time the second letter electromagnet lSScloses its armature 72 whereby through plus to 60, magnet (33. 85, 72 and will become energized armature 6 to minus an energizing circuit will be closed tor the zcrodettcr relay ($3. The circuit got this ma uet is completed through arn'iature'tltl and when it becomes energized it opens at its arn'iature 64 the circuit of the magnets 47. 5t) and 53 causing the deenergization of these magnets.

It; will be seen therefore that it the first letter is correct, then the impulse magnets are returned to normal and the magnets 69 and T l remain energized whereby thi apparatus is prepared for the receivingot the second letter.

If this second letter is correct. then upon the receiving of the third impulse of it (a dash) the supplementary silence magnet 67 60 in the above described manner. In view of the "fact that at this time the magnet 74 is energized the dash line 14 is connected through the armatures 76 and 61 which are in operating position. armature 83 which is in normal position and armature 77 which is in operated position with the third letter el ctromagnet 78. This magnet becomes energized and locks up through its armature T9 and trout contact.

The magnet 78 controls in its arn'iaturo 80 the circuit of the aurciliary third impulse magnet 81. However, the latter does not hecome energized until the silent period following the second letter because its circuit will he closed through armature 6 ot' the decnergrized receiving magnet 2 and armature 82. The same thing holds good for the circuit oil? the zero letter magnet 63 which is also controlled through armature 85. armature 72 and by the armature 6 in normal position.

It will be seen that the reception of the third dash of the letter is reg stered by means of the magnet 78 but that the apparatus is not returned to normal and the circuits are not arranged for the receiving ot the third letter until the silent period following the second letter. 'l his is absolutely necessary bet-ween the second and the third letters hbcause it the permutation oi the circuits took place, the apparatus would be returned to normal it the receiving oi the last dash were prolongeo after the permutation because arn'iature'ti would be open.

The magnet 81 locks up through its armature SQ and "front contact, drawing; over ari'nature 8t, thus opening the circuit of the switcl'iing magnet 74. This magnet will l'iecome deenergized. The dot and dash llnes l5 and 14 will now be connected for receiving the letter S in the same manner as at the receiving or the first letter. However, the armature 83 connects the conductor com ing from 61 towards the ringing; magnet 31 whereby upon the proper receiving of the third letter the ringing magnet 31 becomes enersrized locks up through its armature 3t. "llhehell willring. At the same time armature 33 opens the circuits of all the magnets except the magnet 31. The magnets ot the selector will therefore become deenergized. The bell will continue to ring; until the operator stops it by operating the key 35.

It should he noted that the magnet 81, through armature 85, opens thecircuit of the Zero letter magnet (53 for the purpose of giving the ringing magnet Ellsuiiicient time to operate prior to the openingof the arn'iature 61.

Unlike the arrangement disclosed in my second mentioned patent application the ringing magnet 31 is not controlled by the difierentiating silence magnet 27. Wlth the receiving signal of a given nature (dlstress signal) it is preferable to register this signal just as soon as the impulses are received in correct succession and irrespective of the impulses that may follow even if the spacing is improper. It is better it the calling apparatus gives a wrong danger indication than it it does not respond to a distress signal which is followed by a silent period of insufii-cient duration.

All talse impulses that are produced in the second and the third letter will cause the re toration ot the apparatus to its normal position that is to say will place it into condition to receive the first impulse of the first letter. For this purpose the circuits of the elcctromagnets 69. '74, 78 and 81 corresponding to the second and third letters are opened in 23 and 58 upon the receiving of a false impulse no matter what the position of this impulse mightbe in the signal.

Upon the registering of the first letter in response to the operation of the magnet (39, the armature 62 is paralleled by the con tact T3 whereby it the silent period between the first and second letters, between the second and third letters or between the impulses ot the second or third letters is too long when the dili'erential silence magnet 27 becomes dcenerggized and connects its contact 28 with the line 88, then the zero magnet becomes energized and the selector is returned to its normal position.

Having described my invention. what I claim is: V

1. In acall selector adapted to respond to the distress signal, the combination of impulse responsive means timing means coo crating therewith tor determining the length of an impulse, a plurality of relays coopcrating with said timing means, and onnections between the relays wherehv they respond in predetermined sequence to the impulses of the first letter of the distress signal, switching means cooperating therewith for resetting said relays to respond to the second letter of the distress signal. and for resetting said relays to cause them to respond to the third letter oi the d stress signal and means for causing the energizatron of an alarm upon the con'ipl-ation of the third letter of the distress signal.

2. In a call selector adapted to respond to the international distress gnal. the combination of impulse responsive means. timing means cooperating therewith for (lQttBllllllling the length of an in'ipulse. a plurality ol relays and connections therehetwcen whereby they are operated in sequence in respon e to the impulses in the first letter of the distress signal, switching means coopin'ating with said relays for restoring them to initial position at the termination of each letter of the distress signal and for causing them to respond in sequence to next lcttcrfmeans for causing the energization of an alarm u on the termination of the proper sequence 0 signals comprising the distress signal, and means including said relays and timing means for resetting the system to starting position upon the reception of an improper impulse at any stage in the operation thereof.

3. 111 a call selector adapted to respond to the S. O. S. signal, the combination of impulse responsive means, timing means cooperating therewith for determining the length of an impulse, a plurality of relays and connections therebetween whereby they are operated inpredetermined sequence in response to the impulses of the first letter of the distress signal, switching means 00- operating therewith for resetting said relays to initial position upon the completion of each letter of the distress signal, system resetting means including said relays and timing means for restoring the system to initial condition upon the reception of an improper impulse at any stage in the operation thereof and means for causing the operation of said system resetting means upon the expiration of a predetermined silent period after .the termination of any impulse except that causing operation of the last relay or" said plurality.

4. In a call selector adapted to respond to the S. O. S. signal, the combination of impulse responsive means, timing means cooperating therewith for determining the len th of an impulse, a plurality of relays an; connections bet-ween the relays whereby they respond in predetermined sequence to the impulses of each letter of the distress signal, relay resetting means for restoring said relays to initial position after the completion of the reception of each letter of the distress signal, system resetting means in cluding said relays and timing means for restoring the system to starting condition upon the reception of an improper impulse during the reception of the call, a second letter relay for controlling the connections of said system resetting means in a manner to cause it to respond to impulses of different duration, and said relay being arranged to be operated at the termination of the correct reception of the first letter of the distress signal, third letter switching means for re storing the initial connections of said system resetting means upon the completion of the reception of the second letter of the distress signal, means for causing operation of the system resetting means at the expiration of a predetermined silent period during the reception, means for delaying the operation of said former means to permit a greater silent period separating letters of the distress signal, and means for causing energization of an alarm at the termination of the reception of the distress signal.

5. In a call selector adapted to respond to the call S. O. S. the combination of impulse responsive means, timing means cooperating therewith for determining the length of an impulse, two conductors coopcrating with the timing means to be selectively energized according to the length of received impulses, an additional conductor and means whereby it is energized at the beginning only of each impulse, a plurality of relays and means whereby they are connected in a predetermined sequence to said last named conductor, means for restoring the system to initial condition comprising a relay connected to the conductor energized in response to an impulse of improper duration and means controlled by the last of said relays of said sequence to be energized, for restoring said relays to normal condition and for connecting said system restoring means to the other of said first-named conductors first letter of the distress call.

LOUIS L. E. CHAU VEAU. 

